ZWO 1.25-INCH H-ALPHA SII OIII 7NM FILTER SET
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- FWHM：7 plus or minus 0.5nm
- Glass Thickness 1.9+/-0.03 mm (1.25”/31mm/36mm)
- Fine-optically polished to ensure accurate 1/4 wavefront over the both surfaces
- About 90% transmission at H-alpha line 656nm (H-Alpha filter )
- About 90% transmission at SII line 672nm (SII filter )
- About 90% transmission at major OIII line 500nm (OIII filter )
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